$SPDR 标普500指数ETF (SPY.US)$ 为什么看涨期权要比看跌期权便宜这是因为股价即将下跌吗？

$sirius xm (siri.us)$真是讨厌sirius呀

Good morning, traders. Happy Monday, September 9th. The market is climbing after last week's rough start to September. My name is Kevin Travers; here are stories about the U.S. stock market today.
$Palantir (PLTR.US)$ 周一，道琼斯股票指数集团宣布将会替换该股票后，其股价上涨了12%。 $美国航空 (AAL.US)$ 进入S&P 500指数。这并不是唯一的股票交换： $戴尔科技 (DELL.US)$ will repla...